Poison for prairie-dogs.



BRODER LUDWIG JENSEN, OF LAKE CITY, COLORADO.

POISON FOR PRAIRIE-DOGS.

mosses.

No Drawing".

Specification of Letters Patent.

Application filed June 22, 1911.

Patented Oct. 10, 1911.

Serial No. 634,778.

F0 all whom it may concern.

Be it known that l, Bnonnn LUowIo JEN- saN, a citizen of the UnitedStates, residing at Lake City, in the county of Hinsdale, State ofColorado, have invented certain new and useful Improvements in Poisonfor Prairie-Dogs; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to poisons for the extermination of prairie dogsand like rodents and the object of my invention is to provide acomposition of the above described character, which while effectiveagainst prairie dogrs is not attractive to other animals.

A further object of my invention is to provide a poisonous compoundhaving a non-soluble element contained therein by which means thecompound, will to a great extent, be kept from dissolving and enteringthe ground when scattered thereon.

A further object of my invention is to provide a poison which, whileeffective will atthe same time cause the animal consuming the same aslittle pain as poss1ble.

.Vith these objects in view the method of making my improved compoundwill be hereinafter more fully described and the formula thereof given.

My improved compound consists primarily of a mixture of bariumcarbonate, salt, resin and opium too'ether with a fruit juice. Asuitable composition or compound may be prepared in accordance with thefollowing; illustrative specific formula, it being understood howeverthat the proportions here given may be varied if desired without in anyway departing from the scope of my invention.

The juice of one pound of cur-rants.

lln making the compound the resin is finely powdered and inter-mixedwith the salt, the barium carbonate is then boiled in one gallon ofwater and while still hot the opium is added to the solution thusformed, the currants are also boiled in a half gallon of water and thejuice thus obtained is strained oti. This currant juice is then added tothe barium carbonate solution after which the mixture of salt and resinis also added and the whole is thoroughly mixed to form a paste which,is then dried and when so dried forms a powder. The resin contained inthis composition being insoluble renders the composition more effectiveby making it somewhat impervious to water. The salt is particularlyattractive to prairie dogs as also is the currant juice. The opium isemployed because of its effect in deadening the pain of the animalpoisoned and any suitable narcotic may be employed in its place ifdesired.

What is claimed is 1. A prairie dog eradicator comprising intimatelymixed barium carbonate, opium and a baiting material. v

2. A prairie dog eradicator comprising barium carbonate, powdered resin,salt, opium, and a fruit juice.

3. A prairie dog eradicator comprising fifty parts salt, one-half partpowdered resin, two parts barium carbonate and one- -fourth partpowdered opium all mixed together substantially as described.

4. A prairie dog eradicator comprising barium carbonate, a narcotic, anda baiting material.

In testimony whereof, I atlix my signature, in presence of twowitnesses.

BRODER LUDVVIG JENSEN.

WVitnesses H. A. AVERY, BUEL R. WQOD.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

